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What does the passage mainly discuss? According to the passage, the most dramatic change to the oceans caused by plankton duri
What does the passage mainly discuss? According to the passage, the most dramatic change to the oceans caused by plankton duri
admin
2005-01-28
43
问题
What does the passage mainly discuss?
According to the passage, the most dramatic change to the oceans caused by plankton during the Cretaceous period concerned
选项
A、the depth of the water
B、the makeup of the sediment on the ocean floor
C、the decrease in petroleum-producing sediment
D、a decline in the quantity of calcareous ooze on the seafloor
答案
B
解析
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